Added 'new exercise' form and pumped it to admin_course page as modal link. *not tested*
Merge branch 'devel' of github.com:Meta-arviointi/meta-arviointi into devel
Fixed some controller/model/view stuff for Course (moving parts of controller to more appropriate location in model)
Exercises can now be added to all courses (missing checks for incorrect dates (check that dates are between course time(?) and/or start times are not in future compared to end times)
Tried to include adding users to course pages - reverted anything that was done :-p
Merge branch 'devel' of github.com:Meta-arviointi/meta-arviointi into devel